Negative pressure air filtration housing



FIG. 1 is a perspective view of a negative pressure air filtrationhousing showing our new design;

FIG. 2 is a right side elevation view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a front end elevation view thereof; and

FIG. 7 is a rear end elevational view thereof.

The ornamental design for a negative pressure air filtration housing, asshown.